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I'm going to be draining/refilling my rear diff soon. I have about 50K miles on the current fill (Amsoil AGL 80w90). FSM specs 80W90,but I was wondering if Amsoil Severe Gear 75w140 would be a good choice,or would it be too thick and would it be best to stick with the spec 80w90,and refill with Amsoil AGL 80W90?
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